Ventilating chimney-cowl



(N0 Model.)

- M. W. COSTELLO.

VENTILATING CHIMNEY GOWL. 1

No. 339,863. Patented Apr. 13, 1886.

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W Michael nfcwqeao UNITED STATES PATENT OFFICE.

MICHAEL IVILLIAM COSTELLO, OF BOSTON, MASSACHUSETTS.

VENTILATING CHlMNEY-COWL.

SPECIFICATION forming part of Letters Patent No. 339,863, dated April 13, 1886.

Application filed March 1, 1886.

To aZZ whom it may concern:

Be it known that I, llIICI-IAEL WILLIAM COSTELLO, of Boston, in the county of Suffolk, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in Chimney or Flue Cowls or Ventilators; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which Figure 1 is a side elevation, Fig. 2 a front view,and Fig. 3 avertical and longitudinal section,ofa cowl or ventilator containing my invention, the nature of which is defined in the claim hereinafter presented.

The rotary head A of this cowl or ventilator is composed not only of a hollow cone, a, but of a tubular neck, I), extending down from and opening into the cone in manner as represented. This neck swivels or turns around upon and opens into a flue or pipe, B, provided with a spindle, c, fastened to and extended up from bars cl and e, and through a bar, f, and into a socket or step, 9. The two bars at and e go diametrically across the flue or pipe B at right angles to one another. The barf in like manner extends across the neck I), the step being at the top or upper part of the hood or cone (1. A Vane,C,is fixed lengthwise upon and projects above the said cone a in the manner as shown.

A rotary chimneycowl substantially so constructed is an old device to which my improvement has reference, which consists in such a cowl having in the upper part of its hollow cone a series of triangularopenings,d, and to each of them, and extending within the cone, an air-duct, c, the whole being so that when air is blowing in a direction of the axis and toward the nose of the cone such air will enter and pass through the several ducts and into and through the cone, the currents of such air in passing into and out of the cone serving not only to induce a current of air or smoke upward into the cone, but to force or drive such air or smoke out of the mouth of the cone.

I am aware that it isnot new to provide a chimney-cowl of this description with a pipe or duct opening through the nose or front end of the hood and arranged at the middle Serial No. 193,599. (No model.)

of such end, and therefore I do not claim the same. Such an arrangement of an air-induct, besides causing the said induct to be an impediment to the passage of the smoke or air upward into and through the hood, is disadvantageous in other respects, it being liable to produce at times in the flue a downdraft of the smoke or air; also, to operate to prevent the wind from revolving the cowl-head. By having the series of ducts arranged in the upper part of the cone, generally above its axis, and mostly, if not entirely, opening their rear ends in advance of the spindle of the cowl, as represented, the smoke in passing upward into and through the hood is not materially impeded by such ducts, but is met by the air-currents escaping through them, and is by them forcibly driven out of the cowl, the ascending current of smoke or foulair in the flue or chimney being at the time increased in velocity.

I am aware of the ventilators shown and described in the United States Patents Nos. 76,859, 181,050, 239,418, and 261,404. I11 two of such patents are revoluble cowls represented, neither of which has any air-ducts in its upper part. In the remaining two of such patents the ventilators are upright ones and not revoluble, they having openings or ducts in their sides. I make no claim thereto, my improvement having reference to a revoluble cowl, and consisting in a specific arrangement of air-ducts therein-viz., in the upper half of the hood, without there being any in its lower half.

IVith my arrangement and form of hood the air blows against the hood endwise of it and in a direction to cause it to pass directly through each air-induct without first striking against the hood at a right angle or thereabout to the axis of the-opening, and next being deflected upward through such opening. Besides, having no induots in the part of the hood that is below its axis, the smoke can escape with less obstruction from the hood, comparatively speaking. The inducts,

as arranged, operate with the air when pass ing through them to keep the hood steady in the general direction of the air and prevent it from being too suddenly or quickly vibrated by aerial currents striking its vane opening out of it laterally, and open at their A laterally of it. front and rear ends, 'all being substantially as I claim represented. I

The combination, with the rotary conical MICHAEL WILLIAM COSTELLO.

5 hood of a flue-ventilator or chimney-cowl, as Witnesses: described, of a series of air-inducts arranged R. H. EDDY, V f in the upper half of such hood only, and l R. B. TORREY. 1 

